"I was always high up on the lean (yeah, yeah) / Then this girl came here to save my life / Look up to the sky, down on my knees (straight up) / Out of nowhere, you came here to stay the night / In the night-time (woo, yah)"

Kevin Federline and Britney Spears are locked in this endless child support battle, and the latest move from K-Fed's attorney, Mark Vincent Kaplan, is to TOTALLY call out Brit-Brit in the court of law — and the court of public opinion!

According to documents filed this week that were first obtained by The Blast, Kevin's attorney claims Spears is using her status as an "extraordinarily wealthy parent" to take advantage of the procedural systems set up in family court.

His lawyer's direct quote about Spears' skirting the system is brutal, too. In the docs, Kaplan wrote (below):

And while the rapper comes across as very impatient and antsy — whether at a photo shoot, or playing a pickup basketball game — the new mom seriously sits back like the boss she is, running the show and her business empire all in a day's work.

Let's get down to it — some highlights from the interview (below), beginning with a fascinating and previously-untold wrinkle about how Stormi Webster's parents met, and how their relationship actually started:

According to an US Weekly source, the model and the singer "were snuggled in the back corner," were "very sweet and laughing/whispering with each other," and were "sitting on the same side of a four top instead of across from each other."

Gigi Hadid's sister and the Pray for Me crooner both wore denim jackets.

The on-again, off-again couple — who called it quits in November 2016 — sparked